@davecb I can now hold an advanted tuck planche with good form for a few seconds.
I started to follow a program inspired by kilroy70's routine and I'm really glad I did. My progress with straight arm exercises was too slow and I realized I needed a specific routine.
Standing, raise and lower dumbbells, with locked arms to overhead (3x10)
Supine, raise and lower dumbbells, with locked arms to perpendicular (3x10)
And then I do some push/pull exercises after that.
I took the dumbbell exercises from a former gymnast who said on a forum he had a planche press to handstand on rings when there were none in international competition at his age.